The following companies have been evaluated by Oregon Department of Transportation personnel and have been determined to provide preservative treated guardrail posts and blocks that comply with Section 02190. Guardrail posts and blocks from these companies may be used on construction or maintenance projects upon receipt of documentation of treatment from the company and visual determination that the product is stamped with the company's identification marks.
- All Weather Wood, LLC Plant #580
- Conrad Forest Products, North Bend
- Texas Electric Cooperatives
- Exterior Wood, Washougal, WA
- Hoover Treated Wood Products, Winston
Other companies may be evaluated in the future and may be added to the above list. During the evaluation process, these companies will be listed below. Treated products from companies being evaluated for a list approval will be inspected on a per job basis by ODOT personnel and will be marked with a "Circle S" (a capital "S" inside a circle) stamp. Any questions about treatment company approval should be directed to the Structural Materials Engineer at 503-986-3053.